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A237465 as a simple table

n a(n)
1 81
2 356
3 1566
4 6954
5 30913
6 136488
7 603184
8 2671904
9 11847888
10 52383008
11 231824656
12 1026098208
13 4546286096
14 20109616256
15 89038511104
16 393995791360
17 1745176506880
18 7720658462720
19 34190008144896
20 151276942817792

[81,356,1566,6954,30913,136488,603184,2671904,
 11847888,52383008,231824656,1026098208,4546286096,
 20109616256,89038511104,393995791360,
 1745176506880,7720658462720,34190008144896,
 151276942817792]

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Last modified June 29 05:44 EDT 2022. Contains 354910 sequences. (Running on oeis4.)